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. >> reporter: it does not appear that the chemical in question was one of those most feared in president assad's arsenal. mustard gas or the deadly nerve agent, vx, and sarin. president obama said he was deeply skeptical that it was the rebels who carried out this attack. despite fears of chemical weapons being used in syria, the president said chemical weapons or not, the united states would not take military action in syria by itself. >> thank you, alex. >>> now we return back home to a new number confirming a worry in american families. tonight, one in 50 schoolchildren in america has a form of autism. the government survey is much higher than the previous estimate, 1 in 88. so what is happening? and also tonight, another small part of the puzzle. does it have anything to do with parents and grandfathers? abc's chief medical editor, dr. richard besser, on the clues. >> reporter: and now another clue into a possible cause of autism -- grandfather's age. researchers in sweden have found that the older a grandfather was when he had children, the more likely those children would be to have chil
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